CN113226734A

CN113226734A - Method for producing veneered wood-based panel and wood-based panel made of a carrier plate and at least two veneers

Info

Publication number: CN113226734A
Application number: CN201980083963.3A
Authority: CN
Inventors: 诺贝特·卡尔瓦
Original assignee: Flooring Technologies Ltd
Current assignee: Flooring Technologies Ltd
Priority date: 2018-12-19
Filing date: 2019-12-18
Publication date: 2021-08-06
Anticipated expiration: 2039-12-18
Also published as: RU2764890C1; RU2022100785A; PT3670176T; EP3670176A1; CL2021001356A1; CA3118515A1; PL3670176T3; US20220016872A1; JP7497350B2; EP3898228A1; BR112021009424A2; WO2020127556A1; CN113226734B; ES2874785T3; JP2022510559A; EP3670176B1

Abstract

The invention relates to a method for producing a wood-based panel having a carrier plate and at least one first, non-exterior and second veneer located on a first surface of the carrier plate, wherein the carrier plate, the first veneer and the at least second veneer are connected to each other by a synthetic resin. In order to produce a cost-effective wood-based board with a veneered surface, liquid synthetic resin is applied in an excess manner to the carrier board and/or to the first veneer and/or to at least the second veneer with respect to the amount required for gluing purposes, the excess applied synthetic resin is dried but cured, -a stack of materials to be pressed comprising the carrier board, the first, non-outer veneer and at least the second veneer is assembled, and-the stack of materials to be pressed is compressed in a high-pressure press to form the wood-based board.

Description

Method for producing veneered wood-based panel and wood-based panel made of a carrier plate and at least two veneers

The invention relates to a method for producing a wood material, wherein a support plate and at least two veneers are connected by means of a synthetic resin, and to a wood material sheet which is clad with at least two veneers.

Wood materials with a veneered surface are known from e.g. EP 2902196 a 1. The wood material includes a wood material support (e.g., HDF or high density fiberboard, OSB board, particle board) on which a synthetic resin layer is applied, the synthetic resin layer fixing the veneer by penetrating the veneer with the synthetic resin. The veneer used generally has a thickness of 0.8mm to 2.5 mm. Documents US 2011/162308 a1, WO2017/162926 a1 and EP 2353861 a1 also disclose veneered wood material boards and methods for producing the veneered wood material boards.

The veneered surface has a very high value as a solid wood surface. The veneered surface has a pleasant surface feel and creates pleasant acoustic conditions. The veneered surface is considered to be of particularly high quality, wherein the thickness of the applied veneer is one of the criteria evaluated. At the same time, veneers suitable as a covering layer for panels are the most expensive components in wood composites.

This therefore has the object of providing a wood material, wherein a high-quality veneer surface is provided on the support plate in a cost-effective manner.

This object is solved by a method according to claim 1 and by a wood material board according to claim 9. The dependent claims claim specific embodiments of the invention.

The method for producing a wooden material is based on a support plate and a first, non-external veneer, both of which are connected to each other on a first surface of the support plate by means of a synthetic resin. However, according to the present invention, at least a second veneer is applied to the first surface of the support plate, unlike the prior art. The second veneer is applied to the first veneer. In order to connect the support plate and the veneer, a liquid synthetic resin is applied to the support plate and/or the veneer in an excess manner. Excess here refers to the amount of synthetic resin additionally applied to the support plate and/or veneer in relation to the amount of synthetic resin required for gluing purposes. Alternatively, the person skilled in the art will know from the specifications of the synthetic resin manufacturer the amount of synthetic resin required for gluing purposes, or they will know on the basis of their technical knowledge how much amount of synthetic resin is required for gluing the veneer and the support plate to each other. Typical application rates of the synthetic resin for the application of the veneers without overdosing are, for example, up to 60g/m²To 100g/m²Most often 80g/m². The amount of synthetic resin required for gluing purposes may also possibly be determined by means of some tests for orientation. Once the amount of synthetic resin needed for gluing purposes is known, the excess amount can be determined by means of some tests. The synthetic resin applied in excess is then allowed to dry but not cure. The support plate and the veneer are assembled to form a stack of material to be pressed, which is then compressed in a high pressure press to form the wood material.

In this way, on the one hand, thick veneer applications can be achieved, wherein a first cost-effective veneer and a high-quality, thinner second veneer on top of the first veneer are used, so that a high-quality but cost-effective wood material board with a veneer surface is provided. Thus, for example, by using a 1.5mm thick cost-effective poplar veneer as the first veneer and a 0.6mm thick expensive oak veneer, a 2.1mm veneer layer on the back sheet can be achieved at a lower cost than by using a 2.1mm oak veneer. The thickness of the at least one second sheet is preferably up to 0.15 to 0.3 times the thickness of the first sheet. Typically, if several veneers are used, the thickness of the outermost veneer, which in the context of the present invention is also referred to as second veneer and forms the visible surface of the wood material, is equal to 0.15 to 0.3 times the thickness of the veneer arranged below the outermost veneer.

In addition, veneers of different colors may be used such that a darker second veneer overlays a lighter colored first veneer. By partially removing the second veneer, the first, lighter colored veneer becomes visible, such that the effect of a tessellated woodworking article, for example, is produced. The above-mentioned color sequence is only one possible arrangement of at least two single plates on the first surface of the support plate. It should be clearly understood that any given sequence of veneers of different colors may be arranged on the first surface of the support plate, and in case of more than two veneers, partial removal of the first and second veneers will produce an aesthetically appealing effect. The removal of the single plate down to the first surface of the support plate also creates an aesthetically appealing effect in a cost-effective manner. A typical application of partial removal is the application of a chamfer at the transition from the first surface to the side face of the support plate. Then, in this area, the veneers are visible side by side. The above surface design appears to be of high value. According to the present invention, the above-described surface design can be provided easily and in a cost-effective manner.

Embodiments of the method according to the invention provide that at least three, four, five or more veneers are applied to the first surface of the support plate. Any given number of veneers may be applied on top of each other to the first surface of the support plate. The method according to the invention is limited only by the properties of the press described below, which must be able to soften and allow the curing of the dried synthetic resin applied in excess to the veneers arranged on top of each other. Furthermore, when a first and a second veneer of the same or different thickness are arranged on top of each other on the sides or chamfers of the support plate, a color effect similar to that of a composite plate may be produced by arranging veneers having different colors on top of each other. The more veneers are arranged on top of each other, the more this effect will be apparent.

The method according to the invention works if all the synthetic resin is applied to the surface of the support plate or veneer. Preferably, the synthetic resin applied in excess is applied to the first surface of the support plate or the surface of the veneer that is the most non-exterior surface, i.e. the non-exterior surface is not the exterior surface in the stack of materials to be pressed or in the finished wood material, which is in contact with the press plate or represents the surface of the wood material. Furthermore, it is preferred that the synthetic resin applied in excess is applied to the surface of the support plate and/or veneer in at least two parts. For example, the excessively applied first partial amount of the synthetic resin is applied to the first surface of the support plate and the side of the first veneer opposite to the second veneer, or to the side of the first veneer facing the support plate and the side of the second veneer facing the first veneer. Alternatively, both side portions of the first veneer may be each applied with an excessive amount of synthetic resin applied thereto. More alternatives are created without constraints. The advantage of the synthetic resin applied in partial amounts is that the distribution of the synthetic resin, and thus the adhesion between the veneer and the support plate, can be achieved particularly quickly and uniformly.

The method according to the invention provides that the stack of material to be pressed is compressed in a high-pressure press, typically a continuous or short-cycle press. In this step, the re-liquefied synthetic resin is compressed into a lower density veneer at the press-molding temperature; the generally denser surface of the support plate absorbs less synthetic resin. At the same time, the veneer is compressed by the pressure applied by the high-pressure press. These two effects act in a synergistic combination and increase the compressive strength of the veneer surface. Higher density after veneer compressionThe degree is as great as the contribution to higher compressive strength of at least partial impregnation of the veneer with synthetic resin. Both measures are in contradiction to the usual methods for producing wood material with a veneer surface. On the one hand, synthetic resins used only for attaching veneers to support plates are generally rarely used up to 100g/m²And on the other hand, press forming in a high-pressure press is avoided, thereby avoiding compression of the veneer. However, it has been found that the visual and tactile aspects of the wood material according to the invention remain unchanged in its aesthetic aspect.

An essential feature of the invention is that the synthetic resin is used in excess in relation to the amount needed for gluing purposes, since the synthetic resin liquefied again during the press-forming operation will partly penetrate the veneer or, respectively, between the fibres of the veneer and solidify there. It is not necessary for the veneer to be attached to the support plate that the synthetic resin enters the veneer, but the veneer is in contact with the synthetic resin surface enough for the veneer to be attached to the support plate. The amount of excess amounts to at least 30% with respect to the amount of synthetic resin required for gluing the veneer. Advantageously, the amount of synthetic resin used in the method according to the invention amounts to more than 50%, preferably more than 100%, particularly preferably more than 200% of the amount of synthetic resin required for gluing the veneer.

The introduction of substances, such as sawdust, which delay or prevent the synthetic resin from entering the veneer is disadvantageous. The sawdust is used to prevent the synthetic resin from "breaking through", i.e. in particular the synthetic resin enters the veneer up to the veneer surface. The present example of this situation is that described above

And (3) a plate. Preferably, no sawdust is used within the scope of the invention. Typical and known gluing based on veneers on support plates and for gluing, based on 100% solid material, usually up to 100g/m²The amount of synthetic resin according to the invention can be determined and optimized by the expert in the field by several tests for orientation.

Even if used130g/m²The positive effects of the method according to the invention and the positive effects of the wood material according to the invention can also be seen. According to an advantageous embodiment of the invention, for joining the veneer and the support plate and increasing the compressive strength of the veneer, at least 150g/m is used²The synthetic resin of (4). Furthermore, it is preferred to use at least 200g/m²In particular at least 300g/m²Advantageously up to 400g/m²The synthetic resin of (4). All numbers given in the context of the present invention in relation to synthetic resins relate to 100% solid material. In most applications, the second veneer should only be partially impregnated with synthetic resin starting from the support plate or, respectively, from the first veneer. In this case, the outermost veneer surface of at least the second or the respective outermost veneer facing away from the support plate is a solid wood surface. However, it is also easily possible to completely impregnate the first and at least the second veneer with synthetic resin, so that the synthetic resin covers the outermost veneer surface of at least the second veneer or the respective outermost veneer facing away from the support plate.

Such an excess of synthetic resin is usually not applied to the panel in one working operation or, respectively, in one layer, regardless of whether the entire amount or a partial amount of synthetic resin is applied. According to an advantageous embodiment of the invention, a liquid synthetic resin is applied in the first layer and the second layer, wherein the synthetic resin applied in the first layer is optionally dried before the second layer is applied. This process may be repeated several times, for example, as many as six or more layers of synthetic resin are applied to the support plate. During the drying of the synthetic resin it must be ensured that, despite the reduced or preferably stopped flow capacity, the reactivity of the synthetic resin must at least partially remain, so that an adhesion between the support plate, the synthetic resin and the veneer is produced inside the press. After drying, a minimum residual moisture content of at least 0.5% by weight in the synthetic resin is preferably achieved. Therefore, the synthetic resin is dried after being applied in a liquid form, but is not cured. The dried synthetic resin may be sticky. In principle, synthetic resin may also be applied to the veneer, but the low strength of the veneer usually allows only a partial amount of synthetic resin to be applied.

The synthetic resin may be coloured if desired, so that an optically perceptible effect is obtained when the synthetic resin enters the veneer, in order to obtain a higher quality optical effect in combination with other measures, such as applying a print to the veneer, or for example covering the back plate with a particularly thin veneer. The usual hue is a tan or brown hue.

For the embodiments of the invention, synthetic resins which are first liquefied and then cured under the influence of pressure and elevated temperature, in particular under the pressing conditions described below, are suitable. Particularly typical and suitable are melamine resins. If desired, corundum or other known additives, for example to improve the abrasion or scratch resistance of the surface, can be added to the melamine resin. Fibers, in particular cellulose fibers, preferably cornified cellulose fibers, can be introduced into the melamine resin to form a better layer. The urea-based glues or polyvinyl acetate glues that are normally used for gluing the veneer on the support plate are not well suited for use in high-pressure presses, on the one hand because they do not melt under the applicable pressure and temperature conditions and will therefore not penetrate and solidify on the veneer. On the other hand, for example, the urea-based glue is not resistant to fading and, when penetrating the veneer to a large extent, will cause yellowing in a short time.

According to the invention, the stack of material to be pressed is compressed in a high-pressure press. At a press forming pressure of 3N/m²To 5N/m²Typical veneer presses for applying veneers to a support plate operating at a press forming temperature up to 120 ℃ and a press forming duration of 3 to 5 minutes are not sufficient to compress and cure large amounts of synthetic resin in an efficient manner, especially within an acceptable time. Furthermore, the pressure of the veneer press is not sufficient to compress the veneer. Thus, according to the invention, it is proposed to use a high-pressure press, such as a continuous press or a short cycle press, in which a pressure of, for example, 25N/mm can be achieved²And 50N/mm²Pressure of the press forming. Pressing in high-pressure pressesThe forming time is advantageously between 20 and 60 seconds. The press forming temperature is preferably between 160 ℃ and 200 ℃. Under these conditions, high-pressure presses are critical compared to conventional single-plate presses, in particular in terms of the press-forming pressure, it being possible to ensure that the synthetic resin at least partially penetrates the single plate and that the single plate is compressed.

In the wood material according to the invention, the support plate and the first and at least second veneer are connected to each other on the first surface of the support plate by means of a synthetic resin, wherein the veneers are compressed and the synthetic resin penetrates at least 30% of the veneer thickness of the first and at least second veneer. In this context, the first veneer need not be penetrated by the synthetic resin over the entire surface area along which the first and second veneers are in contact with each other, but those areas of the first veneer which are completely penetrated by the synthetic resin must only be sufficient to join the second veneer to the first veneer. According to a preferred embodiment the synthetic resin penetrates at least 50% of the thickness of the veneer of at least the second veneer, advantageously at least 70% of the thickness of the veneer, but maximally 100% of the thickness of the veneer. The numbers are associated with the compressed first board and at least a second board. The penetration of the synthetic resin into the veneer is detected and measured optically by measuring the total thickness of the veneer and the fraction of the veneer that is impregnated with the synthetic resin.

According to another embodiment of the present invention, the first and at least second single sheet are advantageously compressed by at least 30% of the original thickness, preferably by at least 50% of the original thickness. The compression of the first veneer and the at least second veneer need not be performed to the same extent. If the first and at least second veneers have different thicknesses, the veneers will be compressed in different ways. Despite the compression, the outer veneer surface facing away from the support plate remains attractive from an aesthetic and surface-feel point of view. Tests have shown that the introduction of an excess of synthetic resin in relation to the actual gluing amount is not problematic, since the re-liquefied synthetic resin displaces air from the veneer during compression and penetrates the intermediate spaces between the wood fibres and solidifies there. Thus, the penetrated synthetic resin increases the compressive strength.

The above description shows numerous advantages of the method according to the invention or correspondingly of the wood material according to the invention. The method proposed herein is easy to implement and, due to the short duration of the press-forming, is also very effective in the case of the known apparatuses. Profiling tests on the wood material according to the invention have shown that edge treatment can be achieved in a simple and accurate manner; the tearing of the veneer, which is unfortunately common on known veneers after edge cutting, does not occur here. The wood material according to the invention is suitable not only for walls and ceilings, but also for floors. Furthermore, such a wood material is very suitable for use in furniture or furniture parts having surfaces which are subject to stress, in which case it is not necessary to use solid wood surfaces. In particular, good moisture resistance must be emphasized, especially when the synthetic resin penetrates more than 50% of the veneer.

The veneer surface, i.e. the visible surface of the outer or respectively at least second veneer of the wood material facing away from the support plate, may be surface treated before or during, in particular after, compression. In particular, in order to obtain a relief-like or three-dimensional structure providing, for example, a pore structure specific to the wood type, the embossing of the wood surface can be carried out during or after the compression of the mass of material to be pressed. However, for example in order to obtain a wood-type specific colouring of the veneer surface, the application of the print to the veneer surface can also be carried out, preferably after compression of the stack of materials to be pressed. According to an advantageous further embodiment of the invention, the embossing and printing applications are carried out in a correlated manner, so that a synchronized decoration is produced, wherein the coloring and color arrangement and the embossing are synchronized with one another. Embossing and printing applications may be used in particular to give veneers with a lower optical appeal a higher quality appearance or to provide veneers arranged adjacent to each other with an optical appearance different from a more uniform appearance.

The surface of the veneer to which the printing and/or embossing is potentially applied may then be oiled or painted. Oiling and painting are common protective measures for the surface of veneers. Alternatively, the surface of the potentially printed and/or embossed veneer may also be covered with a cover, i.e. paper impregnated with synthetic resin, as is common for predominantly laminated products. The press forming conditions in the high pressure press are sufficient to attach the cover to the veneer surface.

According to another embodiment of the invention, the stack of materials to be pressed may also have a mat, paper or nonwoven possibly impregnated with synthetic resin, which is bonded to the support plate and the veneer during compression. The spacer is typically disposed between the support plate and the first single plate, but may be disposed between the first single plate and the second single plate. For example at 30g/m²To 50g/m²The grammage of the used paper or especially nonwoven provides a further increased compressive strength of the first and second veneers on the wood material according to the invention, since the nonwoven distributes and deflects the compressive forces acting on the veneers. When the balls in the ball drop test according to DIN EN 13329 are applied to the surface of a veneer of a wood material, the balls will leave a smaller ball indentation, i.e. a smaller deformation, if a non-woven fabric or paper is arranged outside or respectively at least underneath the second veneer or underneath the first veneer. Even if the single sheet is processed to have a smaller size compared to the support sheet, paper or nonwoven may prove advantageous. This greatly simplifies the assembly of the stack of materials to be pressed if the single-plate pieces of the first single plate and/or the second single plate have been assembled in advance and are attached to the paper or nonwoven having the dimensions of the support plate. Then, the composite material of paper or nonwoven fabric and veneer piece can be easily disposed on the support plate of synthetic resin coated with liquid and then dried.

If a nonwoven or paper is arranged below at least the second veneer or respectively the outermost veneer of the wood material according to the invention, such a nonwoven or paper, which itself has been given an increase in strength as described above, may additionally be provided with additives which improve, for example, the flammability, the electrical conductivity, the resistance to the ingress of moisture, fungi, insects, etc. Alternatively, at least the second veneer or respectively the outermost veneer may be provided with such an additive.

According to an advantageous embodiment of the invention, on the bottom surface of the support plate facing away from the first surface covered by the first single plate and the second single plate arranged on top of each other, a shim plate may be provided, which ensures a balanced stress ratio on both covered sides of the support plate. The underlay sheet can be realized in different ways, for example by applying paper impregnated with resin, by using a synthetic resin layer, or by applying a veneer. Alternatively, the bottom surface of the support plate may be coated with a first single sheet and at least a second single sheet in the same or similar order, the first single sheet and at least the second single sheet being attached by an excess of applied synthetic resin. If a synthetic resin layer is chosen as the underlay sheet, the underlay sheet may optionally be provided with fibres. The stress that builds up on the surface of the support plate and possibly in the veneer can potentially be reduced by wetting. Since water can still penetrate into the mass of material to be pressed even after the liquid synthetic resin has dried, lower stresses will advantageously accumulate in view of the excess amount of synthetic resin and the water contained therein, so that wood material can be produced without a mat, or correspondingly the mat must compensate for the smaller forces acting on the material.

As the support plate, a wood material plate such as a mineral or synthetic resin bonded wood material plate, a particle board, an OSB board, an HDF board (high density fiberboard or medium density fiberboard with increased initial density) or a medium density fiberboard (MDF board) may be used, but a plywood plate, a veneer plate, a core board, a laminated board or a solid wood board may also be used. Due to the excessive amount of synthetic resin, the method according to the invention can tolerate irregularities of the surface of the board, so that even boards with a rougher surface structure can be used.

The first and at least second veneers may be stripped veneers, sawn veneers or sliced veneers. The veneer used may be embossed or printed may be applied to the veneer used, but also veneers attached to non-woven or paper, in particular assembled veneer pieces, may be used.

The details of the present invention are explained in more detail using exemplary embodiments. In the drawings:

figure 1 shows a schematic view of a wood based material according to the invention,

figure 2 shows a schematic view of a first and a second veneer which are completely penetrated by a synthetic resin,

fig. 3 shows a schematic view of a first veneer which is completely penetrated by a synthetic resin and a second veneer which is partially penetrated by a synthetic resin.

Fig. 1 shows a schematic view of a veneered wood material 1 according to the invention, where the supporting plate 2 has two veneers on a first surface, the top surface 3. The support plate 2 has a top surface 3 and a lower side 4. On the top face 3, a first single plate 5a and a second single plate 5b located above the first single plate 5a are arranged, and on the lower side, a tie plate 6 is arranged. Between the support plate 2 and the first veneer 5a, a synthetic resin layer 7 is arranged, wherein the synthetic resin 7 has penetrated completely the first veneer 5a and has penetrated approximately 50% of the second veneer 5b (see fig. 2). Fig. 3 shows a support plate 2 having a first single plate 5a and a second single plate 5b which are completely penetrated by a synthetic resin.

According to the embodiment of fig. 1 to 3, the entire synthetic resin applied in excess is arranged as a layer 7 on the top face 3 of the support plate 2. However, alternatively, the synthetic resin may be disposed on the veneer surface of the first veneer or the second veneer. In this connection, it is particularly preferred that the synthetic resin is not applied to the outer surface of the outermost veneer, here the second veneer 5 b. The synthetic resin may additionally be applied to the support plate and the veneer in several layers, for example to the top surface 3 of the support plate 2 and between the first veneer 5a and the second veneer 5 b. Application to the support plate and/or the veneer in several layers results in a particularly uniform distribution of the synthetic resin.

Any of the above-described boards made of wood or a wooden material can be used as the support board. The HDF board selected below can be exchanged for another board type without any problem. Any of the above-mentioned veneers may be used as a veneer, and the veneer used may be exchanged for another type of veneer at any time, as an example below. For both the support plate and the veneer, the plate thickness or the veneer thickness or the density of the veneer may vary.

In the following, specific press forming conditions for producing the wood-based material according to the invention are explained. It must be noted that these are only selected press forming conditions and that the above-mentioned pressures, temperatures and time intervals allow for variations in the press forming conditions, for example, the press forming time may be shortened with increasing pressure or increasing temperature or both parameters. The same applies to a reduction in pressure and/or temperature with an increase in the duration of the press-forming.

Exemplary embodiment 1:

melamine resin (75% solid material, application rate: 300 g/m)²) Is rolled onto the first surface of a large-format support plate, which here is for example a HDF board (medium density fiberboard with increased initial density, web: 2800mm by 2070mm by 8 mm). Such a resin is produced, for example, by adding a melamine resin in powder form to a liquid melamine resin (65% by weight). The melamine resin applied to the first surface of the support plate was dried in a circulating air dryer to a residual moisture content of about 10%. Subsequently, four veneers were placed on the dried melamine resin. The veneer is oak veneer and birch veneer which are arranged alternately, and the thickness of each veneer is 0.6 mm. The structure is at 200 ℃ and 400N/cm²Press forming pressure, and a press forming time of 25 seconds. After press forming, the total thickness of the veneer was 1.8 mm. The adhesion of the veneer layers to each other was checked after cooling by means of a cross-cut test. This adhesion is good, that is, even the outermost veneer is firmly attached to the support plate, or correspondingly to the veneer disposed under the outermost veneer. Thereafter, a part of the plate having a width of 2800mm × 205mm is sawed from the large-format plate. The profiles laid without glue and the circumferential chamfer are milled into these partial plates. After laying, multiple visual effects can be discerned in the visible connecting region (chamfer).

Exemplary embodiment 2:

melamine resin (75% solid material, application rate: 300 g/m)²) Rolled onto a large-format support plate, here HDF board (medium density fiberboard with increased initial density, web)Dough making: 2800mm by 2070mm by 8 mm). This resin is produced by adding powdered melamine resin to liquid melamine resin (65% by weight). The melamine resin was dried in a circulating air dryer to a residual moisture content of about 10%. Subsequently, the first veneer and the birch veneer are arranged on the melamine resin, and the second veneer and the redwood veneer are arranged on the first veneer or the corresponding birch veneer. The thickness of the rosewood veneer is 0.5mm, and the thickness of the birch veneer is 1.5 mm. The structure is at 200 ℃ and 400N/cm²Press forming pressure, and a press forming time of 25 seconds. The adhesion of the veneer layers to each other was checked after cooling by means of a cross-cut test. The adhesion was good. Thereafter, a partial plate having a width of 2800mm × 205mm is sawn from the large-format plate. The profiles laid without glue are milled into these partial plates.

The boards thus produced showed a perfect rosewood surface. In contrast to 2mm rosewood veneers as an alternative, the panel according to the invention is significantly more cost-effective due to the use of cost-effective birch veneers.

Exemplary embodiment 3:

melamine resin (75% solid material, application rate: 300 g/m)²) Rolled into a web made of HDF (medium density fiberboard with increased initial density, web: 2800mm x 2070mm x 8 mm). Such a resin is produced, for example, by adding a melamine resin in powder form to a liquid melamine resin (65% by weight). The melamine resin was dried in a circulating air dryer to a residual moisture content of about 10%. Subsequently, three veneers were placed on the dried melamine resin. Each of these veneers was an oak veneer with a thickness of 0.7 mm. The grammage of the steel is 100g/m²Is arranged on top of the first, lowermost veneer, the nonwoven being provided with a conductive additive, such as carbon fibres or conductive carbon black, in an amount of 2 to 5% relative to the weight of the nonwoven. A second oak veneer and a third oak veneer are positioned on top of the second oak veneer. The structure is at 200 ℃ and 400N/cm²Press forming pressure, and 25 second pressCompressed in a short cycle press of type time. The synthetic resin is liquefied in the press, the synthetic resin at least partially penetrating the non-outer veneer and at least partially penetrating the outermost veneer. The adhesion of the veneer layers to each other was checked after cooling by means of a cross-cut test. The adhesion was good.

Thereafter, a partial plate having a width of 2800mm × 205mm is sawn from the large-format plate. On these partial plates, the adhesive-free laid profiles are milled and thereby a floor element is produced. In the lower region of the profile, in which the layer with the conductive nonwoven is located, a strip of conductive silver paint is sprayed at regular intervals (every 5cm), which increases the conductivity. After application of a voltage of 12V, the floor element output was about 80W/m²。

The part-sheet thus produced has a significantly improved electrical conductivity compared to a similar part-sheet without the electrically conductive nonwoven.

The claims (modification according to treaty clause 19)

1. Method for producing a wood material (1), the wood material (1) having a support plate (2) and at least one first, non-exterior veneer (5a) and a second veneer (5b) on a first surface (3) of the support plate, wherein the support plate (2), the first veneer (5a) and at least the second veneer (5b) are connected to each other by means of a synthetic resin (7), wherein

-a liquid synthetic resin (7) given as 100% solid material at least 150/m²Is applied and is thus applied in excess to the support plate (2) and/or the first veneer (5a) and/or the at least second veneer (5b) with respect to the amount required for gluing purposes,

-the synthetic resin (7) applied in excess is dried but not cured,

-said supporting plate (2), said first, non-external single plate (5a) and said at least second single plate (5b) are assembled to form a stack of materials to be pressed, and

-said pile of material to be pressed is pressed in a high-pressure press at 25N/mm²To 50N/mm²At a press forming temperature of from 160 ℃ to 220 ℃ and for from 20 seconds to 220 secondsThe press forming time of 60 seconds is compressed to form the wooden material (1).

2. A method according to claim 1, characterized in that at least three veneers are applied to the first surface (3) of the support plate (2).

3. Method according to claim 1 or 2, characterized in that a first partial quantity of said synthetic resin (7) and at least another partial quantity of said synthetic resin are applied to different surfaces of said support plate (2) and/or said veneer (5a, 5 b).

4. Method according to at least one of the preceding claims, characterized in that the synthetic resin (7) is used in excess of at least 30%, preferably at least 50%, advantageously at least 100%, particularly preferably at least 200% with respect to the amount required for gluing purposes.

5. Method according to at least one of the preceding claims, characterized in that the synthetic resin (7) given as 100% solid material at a time is at least 200g/m²Advantageously at least 300g/m²Particularly preferably up to 400g/m²Is applied to the support plate (2) or the veneer (5a, 5 b).

6. The method according to at least one of the preceding claims, characterized in that said veneer (5a, 5b) is compressed during compression by at least 30%, preferably by at least 50% of the original veneer thickness.

7. Method according to at least one of the preceding claims, characterized in that the outer veneer surface of the wood material (1) is subjected to a surface treatment, in particular embossed, oiled or lacquered, or a print is applied to the outer veneer surface.

8. The method according to at least one of the preceding claims, characterized in that the outer veneer surface of the wood material (1) is embossed and a print is applied to the outer veneer surface, wherein embossing and printing results in a simultaneous decoration formed by embossing and printing.

9. Wooden material according to one of the claims 1 to 8, having a support plate (2) and a first veneer (5a) and at least a second veneer (5b), which support plate (2) and the first veneer (5a) and the at least second veneer (5b) are connected to each other by means of a synthetic resin (7), wherein the at least first, non-outer veneer (5a) and the at least second veneer (5b) are compressed over their veneer thickness, wherein the synthetic resin (7) penetrates at least 100% of the veneer thickness of the first veneer (5a) and penetrates at least 30% of the veneer thickness of the at least second veneer (5b), and wherein the veneer surface is embossed.

10. The wood material according to claim 9, characterized in that in case the wood material (1) has been applied with three veneers on its first surface (3), 100% of the veneer thickness of the first and the at least second veneer and at least 30% of the veneer thickness of the third veneer have been penetrated by synthetic resin.

11. The wood material according to claim 9 or 10, wherein the veneer surface has a print applied thereto.

12. The wood material according to at least one of claims 9 to 11, wherein the first veneer (5a) and the second veneer (5b) have different colors.

13. The wood material according to at least one of claims 9 to 12, characterised in that the second surface (4) of the support plate (2) is provided with a first veneer (5a) and at least a second veneer (5b), the first veneer (5a) and the at least second veneer (5b) being connected to the support plate (2) by means of a synthetic resin (7).

Claims

-a liquid synthetic resin (7) is applied to the support plate (2) and/or the first veneer (5a) and/or the at least second veneer (5b) in an excess with respect to the amount required for gluing purposes,

-the synthetic resin (7) applied in excess is dried but not cured,

-said pile of material to be pressed is pressed in a high-pressure press at 25N/mm²To 50N/mm²Is compressed to form the wooden material (1).

5. Method according to at least one of the preceding claims, characterized in that the synthetic resin (7) given as 100% solid material at a time is at least 150g/m²Preferably at least 200g/m²Advantageously at least 300g/m²Particularly preferably up to 400g/m²Is applied to the support plate (2) or the veneer (5a, 5 b).

9. Wooden material according to one of the claims 1 to 8, having a support plate (2) and a first veneer (5a) and at least a second veneer (5b), which support plate (2) and the first veneer (5a) and the at least second veneer (5b) are connected to each other by means of a synthetic resin (7), wherein the at least first, non-outer veneer (5a) and the at least second veneer (5b) are compressed over their veneer thickness, and wherein the synthetic resin (7) penetrates at least 100% of the veneer thickness of the first veneer (5a) and penetrates at least 30% of the veneer thickness of the at least second veneer (5 b).

10. The wood material according to claim 9, characterized in that in case the wood material (1) has been applied with three veneers on its first surface (3), at least 100% of the veneer thickness of the first and the at least second veneer and at least 30% of the veneer thickness of the third veneer have been penetrated by synthetic resin.

11. The wood material according to claim 9 or 10, wherein the veneer surface has printing and/or embossing applied thereto.